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Free Fall: Objectives: 1. Describe the motion of an object in free fall. 2. Describe the motion of an object thrown up and allowed to fall until it hits the ground. 3. Determine the speed and distance of an object at any time during free fall assuming that air resistance is negligible. 4. Explain why the acceleration of an object in free fall does not depend on the mass of the object.
Weightlessness, condition experienced while in free-fall, in which the effect of gravity is canceled by the inertial (e.g., centrifugal) force resulting from orbital flight. The term zero gravity is often used to describe such a condition. Excluding spaceflight, true weightlessness can be experienced only briefly, as in an airplane following a ballistic (i.e., parabolic) path. Crews of spacecraft are subject to the problems of weightlessness. It was learned from early Soviet and U.S. manned missions that there is a reduction in heart and respiration rates and a progressive loss of body weight and bone calcium during flights of relatively short duration.